Consider the following sequence of unit operations and chemical additions used in the treatment of a river water supply. Briefly stale the function or purpose of each unit process and the reason for each chemical addition.
1. Presedimentation with polymer addition
2. Activated carbon available when needed
3. Mixu1g and flocculation with the addition of alum and polymer
4. Sedimentation
5. Addition of activated carbon
6. Granular-media filtration
7. Postchlorination
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